21959466 has 16 divisors (see below), whose sum is σ = 44001984. Its totient is φ = 7305984.

The previous prime is 21959449. The next prime is 21959473. The reversal of 21959466 is 66495912.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 291 + ... + 6633.

It is an arithmetic number, because the mean of its divisors is an integer number (2750124).

Almost surely, 2^21959466 is an apocalyptic number.

21959466 is an abundant number, since it is smaller than the sum of its proper divisors (22042518).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21959466 is a wasteful number, since it uses less digits than its factorization.

21959466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6925.

The product of its digits is 116640, while the sum is 42.

The square root of 21959466 is about 4686.0928287860. The cubic root of 21959466 is about 280.0317395993.

It can be divided in two parts, 219 and 59466, that added together give a triangular number (59685 = T₃₄₅).

The spelling of 21959466 in words is "twenty-one million, nine hundred fifty-nine thousand, four hundred sixty-six".